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Fusion Science and Technology
Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
T. Ono, T. Umata, N. Okudaira, Y. Uehara, T. Norimura
Fusion Science and Technology | Volume 60 | Number 3 | October 2011 | Pages 1183-1185
Biology | Proceedings of the Ninth International Conference on Tritium Science and Technology | doi.org/10.13182/FST11-A12626
Articles are hosted by Taylor and Francis Online.
We first examined two lines of transgenic mouse, gpt delta and Muta, for sensitivity of radiation-induced mutations in spleen. The gpt delta mouse could detect mutations induced by 2 to 8 Gy of gamma-rays with 2-times higher sensitivity than Muta mouse. The reason seemed to be that radiation induces predominantly deletion type mutation which is rather rare in natural background and gpt delta mouse can detect exclusively this deletion type mutation, whereas Muta mouse detects all types of mutation including the deletion. Next, we applied the gpt delta mouse to study mutation induction by tritiated water. A half ml of saline containing 0, 266 or 532 MBq of tritiated water was administered to the mice intraperitoneally and mutations in spleen were examined 7 days later. The estimated absorbed doses were 0, 3 and 6 Gy, respectively. With 3 Gy, the mutant frequency was elevated approximately 2-fold above control level, and it remained at a similar level with 6 Gy. These indicate that gpt delta mouse could be a good model animal to study genotoxicity of tritium.